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Shandong
Province,
China,
262500
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+86-536-3027478
山东省青州市开发区电商大厦
1201
号
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pressure of the relief valve for hydraulic system has been adjusted to this valve
before delivery from factory, don' t adjust the relief valve aimlessly.
9.6 When left hand drill pipe is used, the direction of making up and breaking
out must be opposite to right hand drill pipe's. If it is needed to the pressure of
making up with the relief valve of making up, it is necessary to loose the four screws
which fix the relief valve to the valve plate of the oil motor, and turn the valve 180
degree, or the relief valve of making up may not be used, i. e. turn off the valve, in
order to avoid insufficient pressure of breaking out unable to break out.
10. Selection of Hydraulic Oil
10.1 In hydraulic transmission, viscosity is a primary parameter in selecting
hydraulic oil. The viscosity of hydraulic oil vary as its working temperature, therefore
the working temperature in oil tank should be kept within range between 15 to 70
degree centigrade. If necessary, hydraulic oil should be heated or cooled.
10.2 In hydraulic oil there should not be slides impurity bigger than 0.05 mm.
10.3 Generally, hydraulic oil should be replaced every year. As the working
condition is poor in oilfields, it is necessary to care of hydraulic oil, and to prevent
water and impurity from going into oil. Check the change of oil quality at regular
intervals according to the change of viscosity and water and impurities contents
determine the time to replace oil.
10.4 30 # antiwar hydraulic oil is recommended for the tongs. When working
temperature is below minus 25 degree centigrade, 30 # cold- proof hydraulic oil is
recommended. It may be substituted temporarily with 30# turbine oil in short- term
work.
